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7.1+2 channel high definition audio codec with two independent s/pdif-out
General Description

The ALC888S, an advanced version of the ALC888, is a high-performance 7.1+2 Channel High Definition Audio Codec that meets Microsoft Windows Vista (WLP 3.08) premium requirements. It provides ten DAC channels that simultaneously support 7.1 sound playback, plus independent stereo sound output (multiple streaming) through the front panel stereo outputs. The ALC888S integrates two stereo ADCs that can support a stereo microphone, and feature Acoustic Echo Cancellation (AEC), Beam Forming (BF), and Noise Suppression (NS) technology.

All analog IO are input and output capable, and headphone amplifiers are also integrated at each analog output. All analog IOs can be re-tasked according to user's definitions, or automatically switched depending on the connected device type.

Support for 16/20/24-bit S/PDIF input and output offers easy connection of PCs to high-quality consumer electronic products such as digital decoders and speakers. The ALC888S incorporates Realtek proprietary converter technology to achieve 97dB dynamic range playback quality and 90dB dynamic range recording quality, and is designed for Windows Vista premium desktop and laptop systems.

The ALC888S features extra (secondary) S/PDIF-OUT outputs and converters that transport digital audio output to a High Definition Media Interface (HDMI) transmitter (becoming more common in high-end PCs).

The ALC888S supports host/soft audio from the Intel ICH series chipset, and also from any other HDA compatible audio controller. With EAX/Direct Sound 3D/I3DL2/A3D compatibility, and excellent software utilities like Karaoke mode, environment emulation, software equalizer, HRTF 3D positional audio, and optional Dolby® Digital Live, DTS® CONNECT, and Dolby® Home Theater programs, the ALC888S provides an excellent home entertainment package and game experience for PC users.

    Hardware Features
  • High-performance DACs with 97dB SNR (A-Weighting), ADCs with 90dB SNR (A-Weighting)
  • Meets performance requirements for Microsoft WLP 3.08 Premium desktop and mobile PCs
  • Ten DAC channels support 16/20/24-bit PCM format for 7.1 sound playback, plus 2 channels of independent stereo sound output (multiple streaming) through the front panel output
  • Two stereo ADCs support 16/20-bit PCM format, one for stereo microphone, one for legacy mixer recording
  • All DACs supports 44.1k/48k/96k/192kHz sample rate
  • All ADCs support 44.1k/48k/96k sample rate
  • Two independent 16/20/24-bit S/PDIF-OUT converters support 44.1k/48k/88.2k/96k/192kHz sample rate, one for nominal digital audio, the other one for digital audio output to a HDMI transmitter
  • One 16/20/24-bit S/PDIF-IN converter supports 44.1k/48k/96k/192kHz sample rate
  • Up to four channels of analog microphone array input are supported for AEC/BF application
  • Supports stereo digital microphone interface for improved voice quality
  • High-quality analog differential CD input
  • Supports external PCBEEP input and built-in digital BEEP generator
  • Software selectable 2.5V/3.75V VREFOUT
  • Two jack detection pins each designed to detect up to 4 jacks
  • Supports legacy analog mixer architecture
  • Wide range (–80dB ~ +42dB) volume control with 1.5dB resolution of analog to analog mixer gain
  • Software selectable boost gain (+10/+20/+30dB) for analog microphone input
  • All analog jacks are stereo input and output re-tasking for analog plug & play
  • Built-in headphone amplifiers for each re-tasking jack
  • Two digital GPIOs (General Purpose Input and Output) and one analog GPIO (AGPIO) for customized applications
  • The analog GPIO (AGPIO) can be a jack detection pin when the analog CD input is used as line level input and configured to support jack detection, which is driver independent
  • Supports anti-pop mode when analog power AVDD is on and digital power is off
  • 48-pin LQFP "Green" package

    Software Features

  • Meets Microsoft WLP 3.08 audio requirements
  • WaveRT-based audio function driver for Windows Vista
  • EAX™ 1.0 & 2.0 compatible
  • Direct Sound 3D™ compatible
  • 3D™ compatible
  • 3DL2 compatible
  • HRTF 3D Positional Audio
  • Emulation of 26 sound environments to enhance gaming experience
  • 10-Band Software Equalizer
  • Voice Cancellation and Key Shifting in Karaoke mode
  • Realtek Media Player
  • Realtek Configuration Panel to improve users experience for Windows Vista
  • Microphone Acoustic Echo Cancellation (AEC), Noise Suppression (NS), and Beam Forming (BF) technology for voice application
  • Features Dolby® Digital Live and DTS® CONNECT™ software (Optional)
  • Features Dolby® Home Theater software (Optional)

  • Desktop multimedia PCs
  • Notebook PCs
  • Information appliances (IA) e.g., set-top box
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Reference Designs


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